Boiler-furnace



(NoMode'L) J. W. WILKINSON.

BOILER FURNACE.

No. 478,210. w Patented July 5, 1892.

llNi'tED STATES ATENT FFICE.

JOSEPH IV. WILKINSON, OF DES MOINES, IOWA.

BOILER-FURNACE.

SPECIFICATION forming part of Letters Patent No. 478,210, dated July 5,1892.

Application filed March 8, 1892.

T0 at whom it mat concern:

Be it known that'I, JOsEPH'W. WILKINSON,-

a citizen of the United States of America, residing at Des Moines, inthe county of Polk and State of Iowa, have invented a Boiler- Furnace,of which the following is a specification.

The object of my invention is to promote combustion of the smoke, soot,and gases arising from burning bituminous coal and obviating theannoyances incident 7 to the lodgment of soot upon the boiler-fines andin the chimneys. This object I attain by the rise, in conjunction with aboiler and a firegrate, of hollow furnace-walls, a hollow bridgewall,and superheating-tubes rearwardly extended from said bridge-wall.

My invention consists in the construction, arrangement, and combinationof parts hereinafter set forth, pointed out in my claims, andillustrated by the accompanying drawings, in which Figure 1 is avertical longitudinal sectional view of the complete furnace. Fig. 2 isa vertical transverse sectional view on the indicated line a: :r ofFig. 1. Fig. 3 is a vertical transverse sectional View on the indicatedline 'y y of Fig. 1.

In the construction of the furnace shown, A designates the side walls ofa furnace, and B a boiler supported thereon.

O designates a bridge-wall having an interior cavity D, opening intointerior cavities F in the side walls A, which latter cavities arelocated on either side of the combustionchamber H, in which the firegrate J is mounted. Perforations K in the bridge-wall O affordcommunication between the cavity D and the combustion-chamber H abovethefire-grate J. Perforations L in the sidewalls A afford communicationbetween the cavity F and the combustion-chamber. A superheating-pipe Mopens from the combustionchamber H below the grate J and, extendingrearward through the bridge-wall, is bent and continued upwardly to aplane slightly below the top of said bridge-wall, from whence said pipeextends rearwardly through and across the hot air chamber, thencetransversely of said chamber, and returns to the bridge wall, and isprovided with an exit Within the cavity D. A curved pipe N, havingperfora- Serial to. 424,121. (No model.)

tions 0 in its forward side, is located in the rear of the bridge-wall Oand directly in the path of the draft from the combustion-chamber,'whichpipe is connected to and communicates with the pipe M through the mediumof the pipe P.

Doors S in'the front wall '1 of the furnace provide means of access tothe combustionchamber.

In the practical operation of my invention approximately coldatmospheric air is drawn into the pipe M from below the grate J andconveyed through and heated Within the hot-air chamber, and is eitherdischarged through the perforations O in the pipe N or into'the cavityD, inreither event immedi ately commingling with the products ofcombustion in its superheated state, and by affiliating therewithproduces an inflammable gas which burns and completely destroys thesmoke, soot, and offensive gases arising from bituminous coal when inprocess of combustion. Owing to the fact that the pipe M will convey agreater amount of air than will pass through the perforations O, aconsiderable quantity of said air so conveyed will 'be discharged intothe cavity D, and'forced in jets through the perforations K andL in asuperheated state, and by commingling 1 with the soot, smoke,andgases'form an inflammable gas, which in burning will consume all thenatural products of combustion.

Having thus described my invention, what I claim as new therein, anddesire to secure by Letters Patent of the United States therefor, 1s

1. In a boiler-furnace, the combination of hollow furnace-walls oneither side of a firegrate, a hollowbridge-wall, the cavity in whichcommunicates'with the cavities in the hollow side walls, and asuperheating-pipe located in a hot-air chamber, one end of which pipeopens within the combustion-chamber below the fire-grate,- the other endof said pipe discharging into the cavity in the bridge-wall, togetherwith perforations in the side walls on either side of thecombustion-chamber and above the grate, as set forth.

2. In a boiler-furnace, a bridge-wallhaving an air-chamber andperforations at its top to discharge air from said chamber, parallelside walls having air-chambers communicating with the air-chamber in thebridge-wall rear of the bridge-Wall, arranged and comand provided withperforations to discharge bined to operate in the manner set forth, for10 air into the combustion-chamber in front of the purposes stated. thebridge-Wa11,an o en-ended air-conve in" I 1 w 5 tube adapted to con eyair into the air-c arn JOSEPH \VILkINhON' her in the bridge-Wall, and aperforated air Witnesses: snperheater and distributer connected with J.RALPH ORWIG, said tube to discharge hot air above and in THOMAS G.ORWIG.

